* {
    margin: 0;
    padding: 0;
}

img {
    width: 100%;
    height: 100%;
    display: block;
}

.box {
    width: 450px;
    position: relative;
    margin: 30px;
}

.box>.img {
    width: 450px;
    height: 450px;
    border: 1px solid #333;
    position: relative;
}

.box>.img>.mask {
    width: 200px;
    height: 200px;
    background-color: yellow;
    opacity: .4;
    position: absolute;
    top: 0px;
    left: 0px;
    visibility: hidden;
    pointer-events: none;
    /* display: none; */
}

.box>ul {
    display: flex;
    list-style: none;
    margin-top: 10px;
}

.box>ul>li {
    width: 54px;
    height: 54px;
    border: 1px solid #333;
    margin-right: 10px;
    cursor: pointer;
}

.box>ul>li.active {
    border-color: red;
}

.box .enlarge {
    width: 400px;
    height: 400px;
    position: absolute;
    top: 0;
    left: 100%;
    background-image: url(./../img/1.jpg) ;
    background-repeat: no-repeat;
    background-size: 800px 800px;
    background-position: 0px 0px;
    /* display: none; */
    visibility: hidden;
}